What is the strength of insulin?
The strength of insulin refers to the number of units of insulin per milliliter of fluid. U-100 is the most commonly used insulin concentration in the United States. U-100 means it has 100 units of insulin per milliliter. The most commonly used concentration in other countries is U-40 which means it has 40 units of insulin per milliliter of fluid. The syringe used to inject insulin must correspond with the concentration of the insulin. If you used U-100 insulin with a U-40 syringe you’ll inject more than double the insulin you need.
